Grinding machinery



April 8, 1930. H. H. ASBRIDGE 1,754,139

GRINDING MACHINERY Filed Feb. 7. 1929 s Sheets-Sheet 1 April 1930. H. H. ASBRIDGE 1,754,139

GRINDING MACHINERY Filed Feb. 1929 5 Sheets-Sheet 2 MN NTnQ AP B, 1930- H. H. ASBRIDGE 1,754,139

GRINDING MACHINERY Filed Feb. '7, 1929 3 Sheets-Sheet 3 I CJE Patented Apr. 5%, 1%30 UNITED STATES PATENT; OFFICE HARRY HALES ASIBRIDGE, OI? ASHTON-ON-IVIEBSEY, ENGLAND, ASSIG-NOR TO THE CHURCHILL MACHINE TOOL COMPANY LIMITED, BROADHEATH, NEAR MAN- CHESTER, ENGLAND, A BRITISH COMPANY GRINDING MACHINERY Application filed February 7, 1929, Serial No.

This invention relates to grinding machinery and particularly to grinding machines of the portable, self-contained type, and has for its object to so construct such machines as to adapt them for the ready and efiective performance of such operations as the truing by grinding of the surfaces of the horn cheeks of the frames of locomotives.

Referring to the three accompanying sheets of explanatory drawings Figure 1 is an elevation, Figure 2 a plan and Figure 3 an end View of a grinding machine constructed in accordance with this invention.

Figure 4 gives an end view in dotted outline of a locomotive and shows the manner in which the said machine operates thereon.

Like reference letters in the different views indicate like parts.

As shown in the drawings, the improved grinding machine comprises an arm or beam a supported on a pivot or trunnion at the upper end of a column b which has a base a mounted on the double slide cl, providing for movements in directions at right angles.

One arm of such arm or beam at carries a spindle on each end of which is afhxed a grinding wheel as c, the operative or abrasive portions of such wheels being of cup or ring shape as is indicated in the section of one of them shown atFigure 2. The said. spindle is driven by an electric motor f attached to the opposite end of the beam 00, the transmission being effected through a shaft or spindle as 9, Figure 1, and suitable gearing, as for eX- ample, a worm 7t and worm wheel 2', as is indicated at Figure 1.

The arm or beam at, with the parts mounted thereon as aforesaid, is oscillated, as required for traversing the end of operative faces of grinding wheels 6 over the work to be trued, preferably by means of an hydraulic motor comprising a cylinder j fitted with a double acting piston actuating a cross-head connected with the beam a by the rod 70. The fluid under pressure for said hydraulic motor is preferably oil for which the column I) serves as a reservoir, the oil being drawn therefrom and forced at the required pressure into the cylinder by the pump Z which, in the example 338,292, and in Great Britain March 3, 1928.

illustrated, is driven from the aforesaid shaft through worm gear m and n and chain 0. Suitable valves and controlling devices are provided for regulating the admission of the oil under pressure to the cylinder and its release therefrom, the said devices preferably including a tappet rod automatically actuated by the reciprocation of the cross-head and having adjustable tappets so that the amplitude of the oscillation of the beam a may be varied to suit requirements.

At. the left hand of Figure 4 the machine is shown in position for grinding the faces of the horn cheeks of a locomotive frame, whilst at the right hand it is operating on the edges of the said cheeks.

What I claim is 1. In a grinding machine, in combination, a column, a beam pivotally mounted upon said column, a grinding wheel mounted at one end of said beam, an electric motor mounted at the other end of said beam, means driving said grinding wheel from said motor, a hydraulic motor connected to said beam for oscillating the same upon said column, a hydraulic pump supplying pressure fluid to said hydraulic motor, and means driving said pump from said electric motor.

2. Tn a grinding machine, in combination, two slides mounted for movements at right angles to one another, a column upon the up per slide, a beam pivotally mounted upon the upper end of said column, a spindle mounted at one end of said beam and parallel with the beam axis, a grinding wheel of ring shape at each end of said spindle, an electric motor at the other end of said beam, a shaft ext-ending along said beam between motor and spindle for driving said grinding wheels, a hydraulic motor carried upon said upper slide and pivotally connected to said beam to oscillate the same, a hydraulic pump supplying pressure fluid to said hydraulic motor from a reservoir within said column, and means driving said pump from said shaft in the beam.

In testimony whereof I have signed my name to this specification.

HARRY HALES ASBRIDGE. 

